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A multiline study of the filamentary infrared dark cloud G351.78-0.54
Zinchenko, I. I.; Ryabukhina, O. L.
We present results of a multiline study of the filamentary infrared dark cloud G351.78-0.54 in the 1.3 and 0.8 mm wavelength bands. The lines of the three isotopologues of carbon monoxide CO, N2H+, CH3CCH, and HNCO were observed. The aim was to study the general structure of the filamentary cloud, its fragmentation…
Optical performance evaluation of the high spatial resolution imaging camera of BepiColombo space mission
Debei, Stefano; Cremonese, Gabriele; Palumbo, Pasquale +2 more
Thermo-elastic analyses of the High spatial Resolution Imaging Camera (HRIC), which is mounted on Mercury Planetary Orbiter BepiColombo Integrated Observatory SYStem suit (SIMBIO-SYS) of BepiColombo space mission, are carried out in order to evaluate the effect of thermo-elastic deformations on the optical performance experienced by the camera at …
Hot graphite dust in the inner regime of NGC 4151
Shalima, P.; Swain, Subhashree; Latha, K. V. P. +1 more
We model the near-infrared (NIR) spectral energy distribution (SED) of NGC 4151 with a 3D radiative transfer SKIRT code, using which torus only (TO) and ring and torus (RAT) scenarios are studied. In the RAT models, a graphite ring-like structure (clumpy or smooth) is incorporated between the torus and the accretion disc. We vary the inclination a…
An X-Ray Study of the White Dwarf Binary AR Scorpii
Takata, J.; Kong, A. K. H.; Li, K. L. +4 more
We report a study of X-ray emission from the white dwarf/M-type star binary system AR Scorpii using archival data taken in 2016-2020. It has been known that the X-ray emission is dominated by optically thin thermal plasma emission and its flux level varies significantly over the orbital phase. The X-ray emission also contains a component that modu…
Revised planet brightness temperatures using the Planck/LFI 2018 data release
Tomasi, Maurizio; Romelli, Erik; Maris, Michele +7 more
Aims: We present new estimates of the brightness temperatures of Jupiter, Saturn, Uranus, and Neptune based on the measurements carried in 2009-2013 by Planck/LFI at 30, 44, and 70 GHz and released to the public in 2018. This work extends the results presented in the 2013 and 2015 Planck/LFI Calibration Papers, based on the data acquired in 2…
HD 63021: Chromospheric Activity and Mass Transfer in a Close Binary
Lester, Kathryn V.; Labadie-Bartz, Jonathan; Stringfellow, Guy S. +13 more
Prompted by X-ray detections from multiple surveys, we investigated the A-type star HD 63021 and found that it is a double-lined spectroscopic binary with highly variable emission associated with the primary star. Analysis of our multiepoch spectroscopic observations, the majority of which were carried out on small-aperture telescopes, indicates a…
Radio Spectral Index Analysis of Southern Hemisphere Symbiotic Stars
Sokoloski, J. L.; Vrtilek, S. D.; Dickey, John M. +2 more
Symbiotic stars show emission across the electromagnetic spectrum from a wide array of physical processes. At centimeter waves, both synchrotron and thermal emissions are seen, often highly variable and associated with outbursts in the optical and X-rays. Most models of the radio emission include an ionized region within the dense wind of the red …
Dynamics in the Transition Region beneath Active Region Upflows Viewed by IRIS
Fu, Hui; Xia, Lidong; Huang, Zhenghua +2 more
Coronal upflows at the edges of active regions (ARs), which are a possible source of slow solar wind, have been found to connect with dynamics in the transition region. To infer at what scale transition region dynamics connect to AR upflows, we investigate the statistical properties of the small-scale dynamics in the transition region underneath t…
A new framework for understanding systematic errors in cluster lens modelling - I. Selection and treatment of cluster member galaxies
Keeton, Charles R.; Raney, Catie A.; Zimmerman, Dhruv T.
With high-quality data from programs like the Hubble Frontier Fields, cluster lensing has reached the point that models are dominated by systematic rather than statistical uncertainties. We introduce a Bayesian framework to quantify systematic effects by determining how different lens modelling choices affect the results. Our framework includes a …
Methods to determine thermal sensitivity of T-SAGE instrument for MICROSCOPE mission
Métris, Gilles; Rodrigues, Manuel; Touboul, Pierre +1 more
MICROSCOPE is a space mission launched in 2016 that aims to test the validity of the Equivalence Principle (EP), the main postulate of General Relativity (GR), with a precision never reached before (Touboul et al., 2001). EP states that two bodies of different compositions and masses fall with the same acceleration in the same gravitational field.…